Resultados de la búsqueda
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Fitting Euphausia superba into Southern Ocean food-web models: a review of data sources and their limitations
sources and their limitations Abstract / Description: This paper aims to provide the overview needed to ... include krill in food-web models and to guide modellers to key sources of data. It describes the strengths ... and live krill), acoustics (distribution, time series, biomass and swarm-scale information), the ... recommended. Observations that krill occupy the underice layer, the 0–10 m layer, the deeper water column and ... . Note that the biomass estimate presented here for Area 48 is at the lower end of a wide range of ... , and it is probably nearer the high end of this range. This value is similar to, or slightly larger ... @pml.ac.uk *New address: Plymouth Marine Laboratory Prospect Place, The Hoe Plymouth PL1 3DH United ... Kingdom S. Nicol and S. Kawaguchi Australian Antarctic Division Department of the Environment, Water ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 219–245 : Autor(es): A. Atkinson, S. Nicol, S. Kawaguchi, E. Pakhomov, L. Quetin, R. Ross, S. Hill, C. Reiss, V. Siegel, G. Tarling (submitted to the 2008 Joint CCAMLR-IWC Workshop)
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Preliminary study on nesting Adélie penguins disturbance by unmanned aerial vehicles
Abstract / Description: The importance of unmanned aerial vehicles (UAVs) in remote sensing is rapidly ... , UAV overflights were conducted in the Adelié penguin (Pygoscelis adeliae) breeding colony at Point ... . Thomas (Western Shore of Admiralty Bay, King George Island, Antarctica, Subarea 48.1). The impacts of ... electric and piston engine UAVs flying at 350 m altitude above ground level (AGL) over the colony were ... allow for a reliable comparison. If done a day before or after the overflight, the margin of error ... The importance of unmanned aerial vehicles (UAVs) in remote sensing is rapidly growing. However ... conducted in the Adelié penguin (Pygoscelis adeliae) breeding colony at Point. Thomas (Western Shore of ... Admiralty Bay, King George Island, Antarctica, Subarea 48.1). The impacts of electric and piston engine ...
Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 1–16 : Autor(es): Korczak-Abshire, M., A. Kidawa, A. Zmarz, R. Storvold, S.R. Karlsen, M. Rodzewicz, K. Chwedorzewska and A. Znój
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Small scale krill surveys: simulations based on observed euphausiid distributions
Abstract / Description: An observed distribution of aggregations of the euphausiid, Meganyctiphanes ... norvegica is used to model the effects of krill swarm orientation and shape on the success of two proposed ... survey designs. The simulation involves a number of random paths of parallel or radially arranged ... transects passing through three distributions each of which is given four rotations. The results indicate ... distribution of aggregations of the euphausiid, Meganyctiphanes norvegica is used to model the effects of ... krill swarm orientation and shape on the success of two proposed survey designs. The simulation ... distributions each of which is given four rotations. The results indicate that the coefficient of variation ... (cv) of mean krill density varies inversely with mean density, and is lowest for the survey design ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 245–256 : Autor(es): Agnew, D.J. and S. Nicol
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Use of indices of predator status and performance in CCAMLR fishery management
seabird and seal predators,collected as part of the CCAMLR Ecosystem Monitoring Program (CEMP) could be ... used in the management, by CCAMLR, of commercial fisheries. It reviews reasons why it is important for ... CCAMLR formally to use such data in its fishery management operations and discusses the constraints ... inherent in the CEMP data, both from predator monitoring and harvesting perspectives. An outline of a ... probably come so long after the start of the causal problem as seriously to prejudice reversal of the ... related to, reproductive performance of seabird and seal predators, collected as part of the CCAMLR ... Ecosystem Monitoring Program (CEMP) could be used in the management, by CCAMLR, of commercial fisheries. lt ... operations and discusses the constraints inherent in the CEMP data, both from predator monitoring and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 353–365 : Autor(es): Croxall, J.P.
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Acoustic data analysis and models of krill spatial distribution
/ Description: Acoustic data obtained on 4-5 January 1987 aboard the R/V Professor Siedlecki were used in three ... (spatial autocorrelation of krill biomass) and the frequency distribution of krill biomass estimate. The ... wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... spectrum appears to lose its power significantly. The semivariance of biomass does not vary significantly ... : o = 1 03 cm2/sec (appropriate for the basic swarm unit of the order of 10 m in size after Okubo's ... obtained on 4-5 January 1987 aboard the RN ProfesSor Siedlecki were used in three descriptors of krill ... autocorrelation of krill biomass) and the frequency distribution of krill biomass estimate. The wavenumber ... spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 .km the spectrum ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Autor(es): Morin, A., A. Okubo and K. Kawasaki
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Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey
variable which depends on both the behavioural and distributional characteristics of the target species and ... midwater trawls and small research trawls, in this case using an Isaacs-Kidd trawl, demonstrated the ... futility of using the latter for trawl census survey biomass assessments due to their highly variable ... catchability over the survey area and also because the biomass estimates thus obtained were characterised by ... comparison. The krill distribution pattern in this area is shown in Figure 1. After the survey this area was ... . Kasatkina* Abstract Midwater trawl catchability is a variable which depends on both the behavioural and ... distributional characteristics of the target species and trawl parameters. Reliability of biomass assessments ... case using an Isaacs-Kidd trawl, demonstrated the futility of using the latter for trawl census ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Autor(es): Kasatkina, S.M.
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?
discriminant analysis can be used to determine the sex of individuals, it is only able to correctly sex a ... difference between the real mean characteristic for a sex, and the apparent mean derived by sexing the birds ... using discriminant analysis. When discriminant functions are able to correctly determine the sex of ... birds with greater than 80% success, the difference between the true and apparent mean is likely to be ... males and females, and these often overlap. Whilst discriminant analysis can be used to determine the ... normal distributions are used to show that there is a difference between the real mean characteristic ... for a sex, and the apparent mean derived by sexing the birds using discriminant analysis. When ... discriminant functions are able to correctly determine the sex of birds with greater than 80% success, the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Autor(es): Agnew, D.J.
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Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.
BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean. Abstract / Description: The distribution, size ... investigated using biological data collected by a Japanese commercial fishing vessel during the austral summer ... shallower banks (<1 000 m), while D. mawsoni was caught on deeper slopes (>1 500 m). Separation of the ... two species by depth may be related to physical intolerance to cooler temperatures because of the lack ... were limited to hauls where the differ- ence in seafloor depth between the start and end- point of the ... Toothfish are the largest nototheniid species in the Southern Ocean, with two species having a cir ... seamounts, between 50 and 60°S, and on the Patagonian Shelf and the southern coast of Chile to 30°S ... Gakuin University 2600 Aihara-cho, Machida Tokyo 194-0292, Japan Abstract The distribution, size ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Autor(es): Taki, K., M. Kiyota, T. Ichii and T. Iwami
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Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000
survey boxes (dimensions 80 km × 100 km) north of South Georgia. The reconstructions were generated from ... line-transect acoustic survey data gathered in the boxes during austral summers from 1996 to 2000 ... . Krill densities had previously been determined at approximately 0.5 km intervals along each of the ten ... 80 km transects in each box, providing about 1 600 density estimates per box. The MaxEnt technique ... ). After reconstruc- tion in the absence of these data, the MaxEnt- generated points at these positions ... km) north of South Georgia. The reconstructions were generated from line-transect acoustic survey ... data gathered in the boxes during austral summers from 1996 to 2000. Krill densities had previously ... been determined at approximately 0.5 km intervals along each of the ten 80 km transects in each box ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Autor(es): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins
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Directed research. Antarctic Marine Living Resources (AMLR). A program development plan
plan Abstract / Description: The US Antarctic Marine Living Resources (AMLR) Program is a national ... program providing information needed for US policy regarding the conservation and management of the marine ... living resources in the ocean areas surrounding Antarctica. The program is in support of US participation ... in the Commission and Scientific Committee of the Convention for the Conservation of Antarctic Marine ... , NOAA, U.S. Department of Commerce (U.S.A.) Abstract The U.S. Antarctic Marine Living Resources ... (AMLR) Program is a national program providing information needed for U.S. policy regarding the ... conservation and management of the marine living resources in the ocean areas surrounding Antarctica. The ... program is in support of U.S. participation in the Commission and Scientific Committee of the Convention ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 363-373 : Autor(es): Office of Science and Technology, NMFS, NOAA, US Department of Commerce (USA)